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Police say their investigation is still very active. Since January, they have assigned new detectives to the case, conducted new interviews and sent existing evidence to the state crime lab for DNA testing.

Police said somebody knows something, and they want that person to come forward.

"I can pretty confidently say we have a lot of information on this case. We have a lot of theories, but we're looking for a little help. We haven't arrested someone. Obviously, that's our goal, and our goal is to find Amber and to return Amber to her family, and we're going to keep plugging away whether DNA turns up something new," Green Bay police Detective Lee Kingston said.

Wilde's family is still looking for closure.

Her family has always marked this anniversary by going to the bluffs of Upper Lake Park in Port Washington to release balloons -- missives to heaven, where they believe Wilde is now.

"It's a note I write every year, and then I give it a kiss, and then I send it off, and so I update her on the year, and then I send it off to her," Amber Wilde's sister, Nicole Ehnert, said.

This year, police are pushing for new leads and new technology for a break that unravels the mystery of her disappearance.

"We've never let go. We remember her all the time," Amber Wilde's grandmother, Jane Wilde, said.

Amber Wilde went to UW-Green Bay hoping to be a doctor. On this day 15 years ago, she made her last call home. Eight days later, her car showed up in a lot near Lambeau Field, but no one's seen her since.

The new detectives and DNA testing give her family new hope. Her grandma said she will speak to Amber Wilde in her prayers Monday night.

Amber Wilde's father said none of that will bring her back, but she deserves justice.

"We know she's not coming back but just to punish the people that did what they did, to take a spectacular young lady off the planet with no reason. There was no excuse what happened to her," Amber Wilde's father, Steve Wilde said.

"I will tell her what a special day it was -- so many remembering her -- and maybe we'll find her soon," Jane Wilde said.

Police are asking anyone with information in the case to call them at at 920-448-3205, or call area Crimestoppers at 920-432-7867.